The fourth instar caterpillar is covered with white powder. Firstly, I painted the whole caterpillar and then I used white tempera to add powder on its body.
1) Permanent Sap Green (PG36, PY110, Winsor&Newton)
2) a mix of Permanent Sap Green and Quinacridone Gold (PO49, Daniel Smith)
3) a mix of those from point 2 + French Ultramarine to make it darker.